There are a couple of things to try in this case.
1)Reset your IE browser completely. Backup your favourites etc and then go to control panel > internet options > Advanced > Reset
2)AV/Malware/Spyware scans - lots of them. Try Adaware, Malwarebytes, Avast etc.. install one, update it completely and scan/clean until it comes up clean. Uninstall it and then move onto the next one.
3)Reinstall your browser completely (Uninstall IE updates, turn off the "Internet Explorer" feature, reboot, reinstall the feature and updates.
4)Attempt running microsofts fixit for IE (available at www.microsoft.com/fixit) and select IE and try "Fix Internte Explorer issues to make IE fast, safe and stable"